Thanks for the shout-out! I'm on the https://www.scalyr.com team and am here if anyone has questions/feedback/suggestions. It grew out of our own frustration with the available tools, exactly as you express.
I would be nice if you had screenshots of the UI...
Thanks for that feedback. We're redesigning the homepage now and will include more screenshots. You can check out the live demo in the meantime to see it in action (the app UI will also get a facelift soon): http://goo.gl/BZ5GNd
(Scalyr founder here) Thanks for the feedback. Agreed, we haven't done much to present the product yet. For the last couple of years, we've been focusing on building out the product while keeping our early users happy -- making sure we can walk the walk before we talk the talk. We'll be launching a completely new home page in a month or so that should do a much better job of presenting what we do. In the meantime, if anyone out there is frustrated with the current monitoring offerings, drop us a line (I'm steve@$COMPANY.com). We have a lot to offer, and we'll go the extra mile and beyond on support.
There's also Stackdriver (full disclosure, I work at Stackdriver)
I have been using it for a month and really like it.